Device for applying yielding pressure to a top roll in a drawing frame



April 12, 1955 T. J. GIEMZA DEVICE FDR APPLYING YIELDING PRESSURE TO ATOP ROLL IN A DRAWING FRAME 2 Sheets-Sheet 1 Filed Dec. 11, 1953JNVENTOR. THADEUS I]. GlEMZA.

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April 12, 1955 T. J. GIEMZA 2,705,817

DEVICE FOR APPLYING YIELDING PRESSURE TO A TOP ROLL IN A DRAWING FRAME 2SheetsSheet 2 Filed Dec. 11, 1953 E. J I

United States Patent DEVICE FOR APPLYING YIELDING PRESSURE TO A TOP ROLLIN A DRAWING FRAME Thadeu s J. Giemza, Whitinsville, Mass., assignor toWh1t1n Machine Works, Whitinsville, Mass., a corporation ofMassachusetts Application December 11, 1953, Serial No. 397,696

' 2 Claims. ((31. 19-135 This invention relates to drawing frames inwhich wool or other similar yarn is drafted.

It is the general object of this invention to provide an improved devicefor applying yielding pressure to a movably mounted top roll in adrawing frame.

To the attainment of this general object, I provide spring-operatedpressure-applying means which may be conveniently placed in operativeposition and as conveniently removed therefrom without displacingassociated parts.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

Preferred forms of the invention are shown in the drawings, in whichFig. 1 is a front elevation of parts of a drawing frame having myimprovements assembled therewith;

Fig. 2 is a sectional end elevation, taken along the line 2-2 in Fig. 1;

Fig. 3 is a perspective view of my improved pressureapplying device;

Fig. 4 is a fragmentary perspective view showing a slight modification;and

Fig. 5 is a plan view, partly in section, of the type of anti-frictiontop roll with which the construction shown in Fig. 4 would beassociated.

Referring to Fig. 1, I have shown parts of a drawing frame of commercialtype and including upper and lower driven rolls and 11 rotatably andslidably mounted in bearing brackets or supports 12 and extending into ahead 14. The head 14 contains mechanism for rotating the rolls 10 and 11and also for reciprocating or traversing the rolls relative to the fixedbearing support 12. It will be understood that the support 12 isduplicated at spaced points throughout the length of the drawing frame.

A traverse rod 16 is slidable in the supports 12 and is connected at 17to the head 14 for reciprocation therewith. Double top rolls 20 areassociated with spaced iliafting portions 21 and 22 of the drawing rolls10 and The specific mechanism for rotating and traversing the rolls 10and 11 forms no part of the present invention, and suitable mechanismfor this purpose is disclosed in the patent to Kooistra, No. 1,973,534issued September 11, 1934.

My improved device for applying pressure to the top rolls 20 comprises arigid metal frame member 30, preferably of aluminum, which frame memberhas slots 31 in its lower portion to receive lugs 32 formed on a part 33which is mounted on the traverse rod 16 and may be secured thereto by aset-screw 35. The position of the part 33 on the traverse rod 16determines the position of the frame member along the axis of thedrawing rolls 10 and 11.

The frame member 30 has a forwardly-extending arm which is slotted atits outer end to receive studs 42 in a bell-crank lever 44. A dependingarm 45 of the lever 44 supports a bearing block 46 which engages themiddle portion or neck 47 of the double top roll 20. The bearing block46 may be of nylon or other similar anti-friction material.

A finger loop 48 on the front side of the arm 45 may be utilized forrelieving pressure on a top roll 20, should removal thereof be desired.

The frame member 30 has an intermediate partition 50 2,705,817 PatentedApr. 12, 1955 "ice 2 with a positioninglug 51 which centers the lowerend of a pressure-applying spring 52. The bell-crank lever 44 has arearwardly-e ttending arm 55 provided with a de, pending lug 56 whichreceives and centers the upper end of the spring 52.

With this construction, the spring 52 applies a desired yieldingpressure to the double top roll 20 through the bell-crank lever 44 andbearing block 46. Bearing members 60 of nylon or other similaranti-friction material are formed to snap over the rolls 10 and 11, and

The rearward thrust of the spring 52 against the neck 47 of the top roll20 will thus be offset by the supporting action of the bearing blocks60.

With this construction, a desired spring pressure is applied to eachdouble top roll 20, and each pressure-1 applying unit or device may bemounted in position or removed therefrom without interference with anyother part of the machine.

All parts of my invention are of light-weight and easily constructed,and the device may be very readily ap plied to different commercialdrawing frames.

For some purposes, it is desirable to use anti-friction top rolls of thetype shown in Fig. 5, in which shells are mounted on ball-bearings 71carried by a short shaft 72 having a neck portion or recess 73. As thisshaft 72 is not driven and commonly does not rotate, the bearing block46 (Fig. 3) may be replaced by the simple bracket 75 shown in Fig. 4.Otherwise the construction and operation is as previously described, thearm 45a and the; loop 48a corresponding in all respects to the arm 45ings 60 and position the frame 30 axially of the drawing rolls 10 and11.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. In a drawing frame having upper and lower draw ing rolls'andassociated top roll units, that improvement which comprises a readilydetachable tension device for each top roll unit comprising anindependent frame member, bearing blocks mounted on said frame memberand engaging said upper and lower drawing rolls at the rear of saidrolls and coacting with said drawing rolls to entirely support saidframe member and tension device, said frame member having an upperforward projection, a bell-crank lever pivotally mounted at the upperend of said forward projection and having a depending arm and arearwardly-extending arm, a pressure-applying device for said top rollunit which is mounted at the free end of said depending lever arm, and aspring effective to apply pressure through said rearwardly-extendinglever arm, said depending lever arm and said pressure-applying device tosaid top roll unit, and said spring being also effective to applyforward pressure through said bearing blocks to said drawing rolls andto thereby hold said frame member and tension device in operativeposition in said drawing frame.

2. In a drawing frame having upper and lower rotated drawing rolls andassociated top roll units, that improvement which comprises a tensiondevice for each top roll unit comprising a frame member, means tosupport said frame member behind said drawing rolls, said frame memberhaving a forward projection, a bell-crank lever pivotally mounted at theouter end of said forward projection and having a depending arm and arearwardly-extending arm, a pressure-applying device for said top rollunit mounted at the free end of said depending lever arm, a springeifective to apply pressure through said rearwardly-extending lever armto said depending lever arm and pressure-applying device and to said toproll unit, a traverse rod, and a part clamped References Cited in thefile of this patent UNITED STATES PATENTS Kooistra Sept. 11, 1934 HughesMar. 2, 1937 4 Harris Dec. 6, 1938 Harris Apr. 4, 1939 Dcnham Dec. 22,1949 Hinton Aug. 10, 1954 FOREIGN PATENTS Great Britain Jan. 18, 1939

